I'm no expert, but I think my luci configuration seems to be broken. In my current file the section
config internal themes is empty and I think it should contain at least
option Bootstrap '/luci-static/bootstrap'. Without that, you cannot save the System / System configuration because there are no "Designs" /empty dropdown list) on the "Language and style" tab. So luci complains that
Option "Design" contains an invalid input value..
I'm running OpenWrt 19.07.3 r11063-85e04e9f46 / LuCI openwrt-19.07 branch git-20.178.63701-ce35d08 and just did an update, containing the broken file. I'm not sure what to do about that, maybe some Dev can take care of that?
Thanks in advance!